I have a 98 RM125 that I picked up a few months back (the bike actually used to belong to Buddy Antunez at one time), and it has a Bill's pipe and an exhaust which I recently re-placed with an FMF Turbine Core II, because I needed something with a spark arrestor. The bike ran great before I replaced the exhaust, with a 165 main, the needle at pos. 3, and I believe it has a stock slow jet in it. When I replaced the exhaust, the only thing I did to the jetting was take the needle up to pos. 4. I didn't like the way it ran, so I moved it back to pos. 3. I haven't ridden it yet, but I did start it up, and it seems to bog a little during the rev at high rpms, and it's smoking more than I'd like it to. It's a white smoke, and I feel that it's a bit excessive, but that could just be the way the bike runs, I dunno.
I rode it in the parking lot (of my barracks) for a brief minute and it seems like when I run it at low rpms, it's okay, but then when I take it up and let it wide open, it gets choppy. If I keep gettin' on the pipe, it will quit the choppiness and run good. What am I experiencing? Is this normal?
On 125 2strokes, is it necessary to stay in the high rpms range to keep from making high end throttle feel choppy and draggy when you do happen to use it?
Thanks for any input.
Brian.